/* 
 * File:   MD5Converter.cpp
 * Author: From Internet
 *
 * 
 */

#include   <stdio.h>   
#include   <stdlib.h>  
#include   <time.h>   
#include   <string.h>  
typedef unsigned char *POINTER;
typedef unsigned short int UINT2;
typedef unsigned long int UINT4;

typedef struct {
    UINT4 state[4];
    UINT4 count[2];
    unsigned char buffer[64];
} MD5_CTX;
void MD5Init(MD5_CTX *);
void MD5Update(MD5_CTX *, unsigned char *, unsigned int);
void MD5Final(unsigned char [16], MD5_CTX *);
#define   S11   7   
#define   S12   12   
#define   S13   17   
#define   S14   22   
#define   S21   5   
#define   S22   9   
#define   S23   14   
#define   S24   20   
#define   S31   4   
#define   S32   11   
#define   S33   16   
#define   S34   23   
#define   S41   6   
#define   S42   10   
#define   S43   15   
#define   S44   21  
static unsigned char PADDING[64] = {
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#define   F(x,   y,   z)   (((x)   &   (y))   |   ((~x)   &   (z)))   
#define   G(x,   y,   z)   (((x)   &   (z))   |   ((y)   &   (~z)))   
#define   H(x,   y,   z)   ((x)   ^   (y)   ^   (z))   
#define   I(x,   y,   z)   ((y)   ^   ((x)   |   (~z)))  
#define   ROTATE_LEFT(x,   n)   (((x)   <<   (n))   |   ((x)   >>   (32-(n))))  
#define   FF(a,   b,   c,   d,   x,   s,   ac)   {     (a)   +=   F   ((b),   (c),   (d))   +   (x)   +   (UINT4)(ac);     (a)   =   ROTATE_LEFT   ((a),   (s));     (a)   +=   (b);       }   
#define   GG(a,   b,   c,   d,   x,   s,   ac)   {     (a)   +=   G   ((b),   (c),   (d))   +   (x)   +   (UINT4)(ac);     (a)   =   ROTATE_LEFT   ((a),   (s));     (a)   +=   (b);       }   
#define   HH(a,   b,   c,   d,   x,   s,   ac)   {     (a)   +=   H   ((b),   (c),   (d))   +   (x)   +   (UINT4)(ac);     (a)   =   ROTATE_LEFT   ((a),   (s));     (a)   +=   (b);       }   
#define   II(a,   b,   c,   d,   x,   s,   ac)   {     (a)   +=   I   ((b),   (c),   (d))   +   (x)   +   (UINT4)(ac);     (a)   =   ROTATE_LEFT   ((a),   (s));     (a)   +=   (b);   }  

inline void Encode(unsigned char *output, UINT4 *input, unsigned int len) {
    unsigned int i, j;

    for (i = 0, j = 0; j < len; i++, j += 4) {
        output[j] = (unsigned char) (input[i] & 0xff);
        output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
        output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
        output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
    }
}

inline void Decode(UINT4 *output, unsigned char *input, unsigned int len) {
    unsigned int i, j;

    for (i = 0, j = 0; j < len; i++, j += 4)
        output[i] = ((UINT4) input[j]) | (((UINT4) input[j + 1]) << 8) |
        (((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
}

inline void MD5Transform(UINT4 state[4], unsigned char block[64]) {
    UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
    Decode(x, block, 64);
    FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /*   1   */
    FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /*   2   */
    FF(c, d, a, b, x[ 2], S13, 0x242070db); /*   3   */
    FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /*   4   */
    FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /*   5   */
    FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /*   6   */
    FF(c, d, a, b, x[ 6], S13, 0xa8304613); /*   7   */
    FF(b, c, d, a, x[ 7], S14, 0xfd469501); /*   8   */
    FF(a, b, c, d, x[ 8], S11, 0x698098d8); /*   9   */
    FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /*   10   */
    FF(c, d, a, b, x[10], S13, 0xffff5bb1); /*   11   */
    FF(b, c, d, a, x[11], S14, 0x895cd7be); /*   12   */
    FF(a, b, c, d, x[12], S11, 0x6b901122); /*   13   */
    FF(d, a, b, c, x[13], S12, 0xfd987193); /*   14   */
    FF(c, d, a, b, x[14], S13, 0xa679438e); /*   15   */
    FF(b, c, d, a, x[15], S14, 0x49b40821); /*   16   */
    GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /*   17   */
    GG(d, a, b, c, x[ 6], S22, 0xc040b340); /*   18   */
    GG(c, d, a, b, x[11], S23, 0x265e5a51); /*   19   */
    GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /*   20   */
    GG(a, b, c, d, x[ 5], S21, 0xd62f105d); /*   21   */
    GG(d, a, b, c, x[10], S22, 0x2441453); /*   22   */
    GG(c, d, a, b, x[15], S23, 0xd8a1e681); /*   23   */
    GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /*   24   */
    GG(a, b, c, d, x[ 9], S21, 0x21e1cde6); /*   25   */
    GG(d, a, b, c, x[14], S22, 0xc33707d6); /*   26   */
    GG(c, d, a, b, x[ 3], S23, 0xf4d50d87); /*   27   */
    GG(b, c, d, a, x[ 8], S24, 0x455a14ed); /*   28   */
    GG(a, b, c, d, x[13], S21, 0xa9e3e905); /*   29   */
    GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8); /*   30   */
    GG(c, d, a, b, x[ 7], S23, 0x676f02d9); /*   31   */
    GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /*   32   */
    HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /*   33   */
    HH(d, a, b, c, x[ 8], S32, 0x8771f681); /*   34   */
    HH(c, d, a, b, x[11], S33, 0x6d9d6122); /*   35   */
    HH(b, c, d, a, x[14], S34, 0xfde5380c); /*   36   */
    HH(a, b, c, d, x[ 1], S31, 0xa4beea44); /*   37   */
    HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9); /*   38   */
    HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60); /*   39   */
    HH(b, c, d, a, x[10], S34, 0xbebfbc70); /*   40   */
    HH(a, b, c, d, x[13], S31, 0x289b7ec6); /*   41   */
    HH(d, a, b, c, x[ 0], S32, 0xeaa127fa); /*   42   */
    HH(c, d, a, b, x[ 3], S33, 0xd4ef3085); /*   43   */
    HH(b, c, d, a, x[ 6], S34, 0x4881d05); /*   44   */
    HH(a, b, c, d, x[ 9], S31, 0xd9d4d039); /*   45   */
    HH(d, a, b, c, x[12], S32, 0xe6db99e5); /*   46   */
    HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /*   47   */
    HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /*   48   */
    II(a, b, c, d, x[ 0], S41, 0xf4292244); /*   49   */
    II(d, a, b, c, x[ 7], S42, 0x432aff97); /*   50   */
    II(c, d, a, b, x[14], S43, 0xab9423a7); /*   51   */
    II(b, c, d, a, x[ 5], S44, 0xfc93a039); /*   52   */
    II(a, b, c, d, x[12], S41, 0x655b59c3); /*   53   */
    II(d, a, b, c, x[ 3], S42, 0x8f0ccc92); /*   54   */
    II(c, d, a, b, x[10], S43, 0xffeff47d); /*   55   */
    II(b, c, d, a, x[ 1], S44, 0x85845dd1); /*   56   */
    II(a, b, c, d, x[ 8], S41, 0x6fa87e4f); /*   57   */
    II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /*   58   */
    II(c, d, a, b, x[ 6], S43, 0xa3014314); /*   59   */
    II(b, c, d, a, x[13], S44, 0x4e0811a1); /*   60   */
    II(a, b, c, d, x[ 4], S41, 0xf7537e82); /*   61   */
    II(d, a, b, c, x[11], S42, 0xbd3af235); /*   62   */
    II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /*   63   */
    II(b, c, d, a, x[ 9], S44, 0xeb86d391); /*   64   */
    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;
    memset((POINTER) x, 0, sizeof (x));
}

inline void MD5Init(MD5_CTX *context) {
    context->count[0] = context->count[1] = 0;
    context->state[0] = 0x67452301;
    context->state[1] = 0xefcdab89;
    context->state[2] = 0x98badcfe;
    context->state[3] = 0x10325476;
}

inline void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen) {
    unsigned int i, index, partLen;

    index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
    if ((context->count[0] += ((UINT4) inputLen << 3))
            < ((UINT4) inputLen << 3))
        context->count[1]++;
    context->count[1] += ((UINT4) inputLen >> 29);

    partLen = 64 - index;

    if (inputLen >= partLen) {
        memcpy((POINTER) & context->buffer[index], (POINTER) input, partLen);
        MD5Transform(context->state, context->buffer);

        for (i = partLen; i + 63 < inputLen; i += 64)
            MD5Transform(context->state, &input[i]);
        index = 0;
    }
    else
        i = 0;

    memcpy((POINTER) & context->buffer[index], (POINTER) & input[i], inputLen - i);
}

inline void MD5Final(unsigned char digest[16], MD5_CTX *context) {
    unsigned char bits[8];
    unsigned int index, padLen;

    Encode(bits, context->count, 8);
    index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
    padLen = (index < 56) ? (56 - index) : (120 - index);
    MD5Update(context, PADDING, padLen);
    MD5Update(context, bits, 8);
    Encode(digest, context->state, 16);
    memset((POINTER) context, 0, sizeof (*context));
}

void MD5Digest(char *pszInput, unsigned long nInputSize, char *pszOutPut) {
    MD5_CTX context;
    unsigned int len = strlen(pszInput);

    MD5Init(&context);
    MD5Update(&context, (unsigned char *) pszInput, len);
    MD5Final((unsigned char *) pszOutPut, &context);
}

//main() {
//    char szDigest[16];
//    char encrypt[200];
//    printf("src:");
//    gets(encrypt);
//    printf("\nres:");
//    MD5Digest(encrypt, strlen(encrypt), szDigest);
//    int i;
//    for (i = 0; i < 16; i++)
//        printf("%02X", (unsigned char) szDigest[i]);
//    getchar();
//}